<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <!-- 自定义属性值 -->
            <!-- :data-id="index+1" -->
            <li v-for="(item,index) in list" :key="item.id" >
                {{ item }}
                <button @click="del(item.id)">删除</button>
            </li>
        </ul>
        <button @click="add">生成</button>
    </div>
    <script src="./准备代码/vue.js"></script>
    <script>
        const app = new Vue({
            el: "#app",
            data: {
                
                list: [],
            },
            methods: {
                add() {
                    this.list.push(parseInt(Math.random() * 21))
                },
                del(id) {
                    this.list = this.list.filter(item => item.id !== id)
                    // this.list = this.list.filter(this.list.index +1 !== id)
                }
            }
        })
    </script>
</body>

</html>